. ♪ [ male announcer ] campbell's green bean casserole. it's amazing what soup can do [ coughs ] [ baby crying ] ♪ [ male announcer ] robitussin® liquid formula soothes your throat on contact and the active ingredient relieves your cough. robitussin®. don't suffer the coughequences™. . >>> our final story tonight, is about a group of american veterans who have found a way to continue serving their country long after their active duty days have passed. all hands on deck, helping to preserve historic american ships. here's nbc's mark potter. >> reporter: at the patriots point navel and maritime museum in charleston, south carolina, u.s. navy veterans now in their 70s have volunteered to help preserve the uss laughy, a destroyer built during world war ii. in 1945, the laughy was hit by five come coz cities and three bombs killing 31 crewmembers. to the men who served afford the laffey, saving her is personal. also at patriot's point is the carrier uss yorktown known as the fighting lady which served in world war ii and vietnam and also